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Sugar-Free Agar (SFA)
Sugar-Free Agar for the enumeration of contaminants in dairy products is a carbohydrate-free medium used for the detection and enumeration of microorganisms that do not undergo specific fermentation processes during the preparation of dairy products. The result of the enumeration furnishes an indication of the level of contamination of the sample tested.
This media is recommended for the enumeration of contaminating microorganisms in butter, fermented milk and fresh cheeses.
The typical composition responds to that defined in the standard ISO 13559.
Available as dehydrated medium :500 g bottle
Also available as ready-to-melt medium :10 vials of 100 ml (BM12208).
In compliance with regulatory requirements, a USDA permit (VS 16-3) is mandatory for shipments from Canada to the USA due to the inclusion of peptone, an animal byproduct.
The presence of the relatively non-nutritive substances supplied by peptones (Tryptone and pancreatic digest of gelatin), as well as the absence of fermentable carbohydrates, leads to a substantial reduction in the growth of specific microorganisms, in particular lactobacilli. This favors the growth of microorganisms that alter the quality of the product.
Sodium chloride maintains the osmotic balance.
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